Presentation on theme: "Materials needed for each student pair for this ppt.’s activities: 4 wires about 4 inches long with both ends stripped off 1 small light bulb 3 more small."— Presentation transcript:
Materials needed for each student pair for this ppt.’s activities: 4 wires about 4 inches long with both ends stripped off 1 small light bulb 3 more small light bulbs in holders, or 3 holiday lights with about 4 inches of wire on either side of the bulb, and each end of the wire stripped off. ( I like to demo with bulbs in holders, but let the students work with holiday lights. It is easier for them to handle…but they must be exposed to the holders as that is usually what is on the state tests. 2 batteries, one in a holder and one not in a holder for the activity mentioned in slide 2 1 large light bulb with the glass broken so students can see inside the light bulb
To make a light bulb light up, you must have three things: Energy source (for us, a battery) Something for the energy to travel on (usually a metal wire with plastic/rubber covering for insulation) Something to use the energy (light bulb, motor, door bell, etc.)
Batteries: Our Energy Source There are many different types of batteries: + - + - + -
What Happens Inside a Battery In a battery, electrons want to move from the negative end of the battery to the positive end of the battery. They can not move inside the battery. The electrons MUST come out of the negative end of the battery and back into the positive end of the battery.
But they will not come out unless they can get back into the battery to get recharged. Honey, I am not leaving until I know I can get back in again!!! What Happens Inside a Battery (continued)
So we use wires for the electrons to travel on.... What Happens Inside a Battery (continued)
When the electrons can travel in and out of the battery, it is called an electric current. What Happens Inside a Battery (continued)